Abstract
The interlaminar shear strength (ILSS) of the fiber-reinforced polymer (FRP) composites is critical in structural applications. At the same time, glass transition temperature Tg determines the degree of crosslinking, which depends majorly on post-curing temperature and time. In this study, the post-curing parameters (time and temperature) are initially varied to analyze their effect on the ILSS and Tg values of the Kevlar/epoxy (KE) laminated composite samples. For optimizing post-curing parameters, the temperatures selected were 70, 140, 210, and 280°C and time designated was 3, 6, and 9 hours. It was found that the KE sample post-cured at 140°C for 6 hours retained its aesthetic properties and gave an optimized result without any sign of over-curing. Further, graphene nanoplatelet (GnP) was added to KE composites (KE-GnP) in 0.25, 0.5 and 1.0 wt % of epoxy. ILSS characterization of KE-GnP was done at 25°C and in-situ elevated-temperature environments of 70, 100, and 140°C. Tg values were also evaluated. A polynomial surface was generated using the curve fitting toolbox of MATLAB from the ILSS data points obtained. Energy-dispersive X‑ray (EDX) spectroscopy was used to observe GnP dispersion uniformity in the matrix. Significant outcomes of the investigation are discussed in this paper.
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ACKNOWLEDGMENTS
Mr. Rajesh Patnaik’s technical assistance is much appreciated.
Funding
The authors are grateful to the National Institute of Technology Rourkela and the Science and Engineering Research Board of India (ECR/2018/001241) for their monetary and infrastructural assistance in completing this study.
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Shubham, Prusty, R.K. & Ray, B.C. In-Situ Elevated Temperature Interlaminar Shear Response and Thermal Behavior of Graphene Nanoplatelet Reinforced Kevlar/Epoxy Laminated Composites. Polym. Sci. Ser. B 64, 553–566 (2022). https://doi.org/10.1134/S1560090422700166
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DOI: https://doi.org/10.1134/S1560090422700166